I have the one from MP-01, as well as the one from MP-13 and both of them have broken stocks. The MP-01 version shattered around the joint because the pin was in too tight and the MP-13 version broke at the clip because the molding on the pistol wasn't very good. I too have searched for replacements on ebay and they are actually quite hard to come by. Currently there are two auctions including them, the clear red one from MP-13B and one (sans stock) along with several other accessories from MP-01B and at $38 and $50 respectively, both auctions are also rather pricey. Maybe when MP-13 was still fairly new they were more common one ebay but certainly not anymore.